While voluntarily performing picket duty under fire, 13 July 1863, was attacked and his surrender demanded, but he killed his assailant. The day following Hibson responded to a call for a volunteer to reconnoiter the enemy's position, and went within the enemy's lines under fire and was exposed to great danger. On 18 July voluntarily exposed himself with great gallantry during an assault, and received three wounds that permanently disabled him for active service.